Electric lamp.



Dl m..w. :P9

t Wam 1m.. H im. m 8, 4 o 7 nw N (No Model.)

INVENTOH W/TNESSES:

sev

UNITED STATES PATENT OFFICE.

HENRY WARD BEEOHER, JR., OF PORT TOWNSEND, WASHINGTON.

ELECTRIC LAM P.

SPECIFICATION forming* part 0f Letters Patent N0. 704,851, dated July 15, 1902. Application iiled February 6, 1902. Serial No. 92,;778. (No modell) To all whom it may concern,.-

Beit known that LHENRY WARD Bnncnnn, Jr., of Port Townsend, in the county of .lefferson and State of llilashington, have in- Vented a newjand useful Improvement -in Electric Lamps, of which the following is a specification.

The object of my invention is to provide an electric incandescent lamp of the Edison type, which Will permit of the variation of the amount of light afforded in a simple and practical way. For this purpose turning-plug switches have heretoforel been employed which embodied a Acommutator with a variable amouut of resistance, more or less of which was thrown into circuit to regulate the intensity of light emanating from a single iilament. It is also old to provide al lamp having two or more filaments of diiferent sizes and radiating power, with connectingcontacts by which from a mere turning of the glass globe the current may be directed through either or both filaments. Myinvention is an improvement in the latter class; and it consists in the peculiar construction and arrangement of the contacts, as lwill be hereinafter more fully described with reference to the drawings, in which- Figure l is a perspective view of my lampglobe. Fig. 2 is a side elevation of the lamp, partly in section; and Figs. 3, 4, and 5 are top views showing the terminal contacts of' the filaments and the three positions of the globe when rotated about its longitudinal axis for sending the current through either or both of the iilaments. n

In the drawings, Gr represents the glass globe, Whose neck is illed'with a non-conducting composition Nysurrounded by the metal screw-threaded collar I.

F and E are the two carbon filaments, of which F is very much larger than E. Both of them connect with the platinum wires sealed in the glass projectionfJ. One end of each filament is connected to the wire D, which connects with the metal collar l at H, and consequently with the corresponding threaded sleeve K of the metal socket when the globe is screwed in place. The other terminals of the laments pass through the nonconducting composition to separate contacts A and B, which are insulated from each other and also from the collarl.v Both these contacts are designed to connect with the springtongue O of the socket of the lamp. This spring-tongue represents one electrode of the lamp-socket, as showin) and the socketsleeve K represents the other electrode, as shown.)

The contacts A and B are in the nature of cams Whose pitch corresponds to theincline of the screw-threads of the socket-collar, and A is thinner, but higherl than B.

New it willbe seen that if the spring-tongue O of the socket rests exclusively on 'A the current will pass through the small filament E and illuminating it only will give a feeble light. If the springtongue C rests exclusively upon the contact B, the current Will pass through the larger filamentF and give a larger amount vof light. lf, however, the spring-tongue O rests on both contacts A and B, the current will pass through both lalight.

To eect the switching or commutation of the current through either or both of the laments, no special commutation-plug is required; but the simple and ordinary plugswitch in the socket is retained, and the glass globe itself is simply rotated more or less about its longitudinal axis. Thus in Fig. 3 the electrode-tongue C of the lamp-socket is shown in dotted lines `resting ou cam-contact A, and as the latter is higher than B contact is made with A; but the tongue does not touch B, as clearly shown in Fig. 2. lf the globe be turned now to the position shown in Fig. ll, the dotted lines of the spring-tongue show it resting exclusively on contact B, and consequently the `current will pass only through the larger filament F and will give a larger amount of light, While if the globe be turned in relation to the spring-tongue to the position shown in Fig. 5, in-which said spring bears upon the top of contact B and also against the side of ContactA, then the current will pass through both filaments, and the maximum amount of light will be radiated.

The candle-power of the filaments of my lamps may be graduated so that for one lamp they may be 2.8 and ten, another lampAaS and twelve, another 4.12 and sixteen or 4.16

and twenty, to suit the particular use to which ments and will give the maximum amount of the lamp is to be put. The means for thus varying the candle-power of the lamp makes a great saving in power consumed, and my invention is very valuable for hospitals, hotels, business houses, and the sick-room, where only a subdued light at times is required. It is very inexpensive, as it does not require any complicated commutating-switch, and is so simple that a child may regulate it.

In pointing out more clearly the distinctive features of my invention I would call attention to the value of making one contact higher than the other. It is to enable the higher contact to hold the spring-ton gue or resilient electrode out of contact with the lower contact, thus securing a more certainly individualized contact when only one filament is to be illumined. B y making the high contact narrow and the low one broad a better collective action in a rotary adjustment is obtained, as the yielding electrode bears iiatwise on the low contact and edgewise on the high contact. By making these contacts also with cam-faces rising with the pitch of the screw-threads of the collar and socket contact is made in a manner harmonious with the advance of the screw-collar in the socket, so that the ordinary screw-socketed Edison llamp may be made available to act by a mere rotary adjustment of the globe in the socket.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. An electric lamp comprising a globe having` a plurality of filaments and a conducting screw-collar for the lam p-socket with one end of each filament connected to said screw-collar and separate insulated contacts arranged on the upper face of the neck of the globe and connected to the other ends of the filaments, said insulated contacts being made as cams having their upper faces inclined to correspond to the pitch of the screw-collar substantially as and for the purpose described.

2. An electriclamp comprising a globe having a plurality of filaments, and a conducting screw-collar for the lam p-socket with one end of each lament connected to said screw-collar, and separate insulated contacts arranged on the upper face of the neck of the globe, and connected to the other ends of the filaments, said contacts being made of different heights to cooperate separately or collectively with a yielding electrode in the lamp-socket substantially as and for the purpose described.

3. An electric lamp comprising a globe havinga plurality of filaments and a conducting screw-collar for the 1am p-socket, with one end of each lament connected to said screw-collar, separate insulated contacts arranged on the upper face of the neck of the globe and connected to the other ends of the laments and made of dierent height as described, and a lamp-socket screw-threaded to mesh with the collar of the globe and having a yielding electrode arranged to bear separately or collectively upon the globe-contacts substantially as described.

4. An electric lamp comprising a globe having a plurality of filaments, and a conducting screw-collar for the lamp-socket with one end of each filament connected to said screw-collar, separate insulated contacts arranged in the upper face of the neck of the globe and connected to the other ends of the filaments and made of different heights as described and a lamp-socket screw-threaded to mesh with the collar of the globe, and having a yielding electrode arranged to bear separately or collectively upon, the globe-contacts, the said yielding electrode and globe-contacts being adapted as described to be brought into separate or collective contact by a rotation of the globe in its socket as described.

5. In an electric lamp of the kind described, a globe having a plurality of filaments with terminal insulated contacts made of different heights as described whereby the higher of said contacts is made to hold a yielding electrode away from and out of contact with the next adjacent and lower contact as described.

6. In an electric lamp of the kind described, a globe having a plurality of filaments with two terminal insulated contacts, one of said contacts being made relatively broad and low and the other one narrow and high in relation to each other substantially as described.

7. In an electric lamp of the kind described, a globe having a plurality of lalnents with terminal insulated contacts having contacting faces inclined to form cams substantially as described.

HENRY WARD BEEOHER, JR.

NVitnesses:

O. C. TERRY, MAURICE L. TIBBALS.

IOC 

